Add changelog for 19.0.0

[jackpope]

No description provided.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 5, 2024 6:16pm

[react-sizebot]

Comparing: 1c9b138714a69cd136a3d82769b1fd9a4b318953...140014c46a9994611ff7347709173c45b8b2c35a

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.82 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	510.81 kB	510.81 kB	=	91.43 kB	91.43 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	515.74 kB	515.74 kB	=	92.14 kB	92.14 kB
facebook-www/ReactDOM-prod.classic.js	=	595.67 kB	595.67 kB	=	105.14 kB	105.14 kB
facebook-www/ReactDOM-prod.modern.js	=	585.93 kB	585.93 kB	=	103.57 kB	103.57 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against 3e4a101

[rickhanlonii]

LGTM

[kachkaev]

Suggested change

	### React
	#### React

Here and below: I guess we need to use level 4 instead of level 3 for sub-headers of New features, Breaking Changes so on. That will ensure the right semantic structure of the document.